Motion Capture System is a technology used to process the motion of people or objects. After using the movements captured by the camera, render those movements onto the avatar. Through this technology, some physical movements of people can be recorded, such as the width of the shoulders, the angle of bending of the knees and elbows, and so on. The body movements of each person are unique, the identity of the person can be identified through these subtle differences. The purpose of this research is to use cameras to record people's movements and determine the identity of an individual from their body language. In conclusion, this proposal uses the technology of Motion Capture System for identity authentication. The marker-less motion capture system will be used to determine the human skeleton diagram. Joint detection algorithm is implemented to identify the human joint. To achieve a better outcome, joint tracking techniques will be employed for continuous identification. Artificial intelligence techniques will be used to identify and analyze human identity based on the skeleton joint diagram.